Imaging,
Polarimetry, SpectropolarimetryTelescope control system interface,
usually Lick ObservatoryIf this area is blank, then no actions are
in progress. If it is flashing "TV",then it means that control currently
resides with the other (image) display terminal.

Calibrator; not
implementedTwo positions, In or Out0, 22.5, 45, or 67.5

The fourth column gives the status of the PC to transputer link
(PC-TLink). Also displayed are the detector temperatures. NOTE: at
present these are not updated by the computer.

The rightmost block in the status display area describes 3 "flags":

FileOvWrt:

If FileOvWrt = OFF, then you CAN overwrite existing files of the
same name.If FileOvWrt = ON, then the file protection is activated.

AutoDisp:

= ON (default) means automatic
display of each image.

AutoScale:

describes how the image display
has been scaled. The default setting takes the MEAN of the data frame as an
offset and then selects a gain which matches the lowest remaining signal to
black and the highest signal to white.

Current Observing Setup:

The fourth panel from the top (pale blue
background - black border) displays the setup for the current
observation. The left and right segments respectively refer to Channel
A (the shortwave (SW) channel with the NICMOS HgCdTe array) and
Channel B (the longwave (LW) channel with the SBRC InSb array).

These panels display the setup in current use or the integration that
has just ended. The entries in these panels correspond directly to
those in the lower black panel called NEXT OBSERVING
SETUP. Changes to the observing setup are made in the lower panel
only. We will return to this critical feature in a moment.

Integration Time Display:

Between the pale blue and the black setup
panels is a graphical display which actively tracks the progress of
the integration. A bar increases in length from 0% to 100% as the
integration proceeds and a countdown display gives the Itime and
Co-adds remaining. This countdown is a timer and does not perfectly
reflect the overhead required for multiple readout modes; occasionally
this overhead will cause the display to count down "negative co-adds".

Function Keys:

Below the black panel containing the Next Observing setup is a thin
dark blue panel with white lettering
describing the FUNCTION keys which provide a single keystroke action
for frequently used command sequences.

F1

direct access to the Channel A setup panel

F2

direct access to the Channel B setup panel

F3

executes a SCRIPT; enter the script name at the
prompt

F4

takes an exposure in BOTH channels
and saves the
data in FITS format in the next available file in a Date/Integer sequence
of the form 26SEAnnn.fts or 26SEBnnn.fts, where nnn is the running file
number and a two-letter abbreviation is used for the month.

F5

same as F4 but for Channel A only; Channel B
is not updated

F6

same as F4 but for Channel B only; Channel A
is not updated

F7

displays again the last image in Channel A

F8

displays again the last image in Channel B

When F7 or F8 is used, control is transferred to the NEC
"display" monitor so that the various function keys defined for image
display can be used.

To return control to the main Instrument Console you must
press theESCkey.

The final bar (gray background) at the
bottom of the Gemini Instrument Console displays special commands
available by pressing the control (CTRL) key and the
Function key together. The most important of these are the
ABORT keys:

CTRL F4

ABORT the twin-channel integration started with F4

CTRL F5

ABORT the Channel A integration started with
F5

CTRL F6

ABORT the Channel B integration started with
F6

One control key has a special function

CTRL F8

forms the difference of the last
two frames
taken in each channel and displays the result. The difference is taken in
the order of (Previous Frame - Most Recent Frame).

Note: No setting of MulReads is necessary in SampMode 6; any
displayed value is ignored.

To leave the Next Observing Setup panel press the ESC
key. There will be a verification/warning panel (in red) with the words "Is this correct?
(Y/N)". Respond by pressing either Y for yes or N for no. Hitting
Return will yield the default (Y). Repeat entire setup process
for Channel B.

These keys place control in the A or B channel display. You may switch
between these directly, or return to the main User Interface by
pressing ESC. Basic information about the image is displayed
below it -- filename, itime, co-add, mean, standard deviation. In
addition the pixel value at the cursor is displayed, as well as the
cursor coordinates. All pixel values are displayed for 1 co-add (that
is the image is divided by the number of co-adds).

You may reposition the cursor using the arrow keys. Pressing
CTRL and the arrow keys simultaneously will move the cursor in
steps of four pixels. When control is transferred from one channel to
the other, the cursor remains on the same pixel number.

The image is displayed with a default display offset and gain. Any
pixel below the offset value is displayed as black. The default value
depends on the parameters selected in the TV Setup menu. To change the
offset, press the DEL key and enter a new value; then press
ENTER. Similarly, to change the display gain, press INS,
enter a new value and then press ENTER; alternately, you may
increment or decrement the display gain using the PAGE UP and
PAGE DOWN keys.

The image can be magnified using the HOME key, which will
"zoom in" on the image, centered on the cursor. To "zoom out" press the
END key. To return to the full screen, exit the Image Display
by pressing ESC, and then redisplay the image using F7
or F8.

Each time control is re-transferred to the image display, the image is redrawn.

CTRL F7 -- File

Pressing CTRL and F7 together will display a file. You
will be prompted for the file name. The file directory will default to
the current data directory (see General
Setup). The input for the filename has a limited number of
characters, so you may need to change the default in order to display
a file from another directory.

CTRL F8 -- Invert

Pressing CTRL and F8 together will invert the current
image without changing the offset.

F9 -- Profile

This key displays an X and Y profile centered on the cursor
position. The profile is tens of pixels wide in both directions.

F10 -- SpPlot

Pressing F10 will prepare to display a spectral plot. The
program will prompt, in the window below the image, for the rows to be
averaged into the plot and the parameters of the plot. The plot will
automatically cover the entire range of displayed columns; if the
image has been zoomed-in, the plot will only be across those columns.

CTRL F10 -- Contour

Pressing CTRL and F10 together will display a contour
plot of the image. The plot will always cover the entire image. You
will be prompted for the floor and ceiling for the plot.

F11 -- Astrometry

Pressing F11 will enter Astrometry mode. The program will
prompt for two cursor positions. The distance between these positions
will be calculated and displayed. Then, if the LICKTCS is in use, you
will have the option of moving the telescope that distance, without
exiting this mode.

F12 -- Phot

Pressing F12 will enter Photometry mode. To return to Image
Display at any time, press ESC. The photometry function will
calculate the flux in a box, subtract the sky from a sky box around
it, and convert the flux to an apparent magnitude based on a
zeropoint. The photometry box is centered on the cursor, as is the sky
box.

The size of these boxes may be changed using ALT-ARROW keys. To
make the "star box" bigger or smaller, press the ALT key and
the UP or DOWN key simultaneously. The box is always
square. To make the sky box bigger or smaller, press the ALT
key and the LEFT or RIGHT arrow key simultaneously. To
change the zero-point, press the INSERT key. To calculate the
photometry, press the ENTER key.

All photometric information is displayed in the window below the image.

CTRL F12 -- Stats

Pressing CTRL and F12 simultaneously will enter
Statistics mode. To return to Image Display at any time, press
ESC. Statistics mode will calculate the mean and standard
deviation in a box. To move the box use the arrow keys. (HINT: it is
faster to move the cursor before entering the Statistics mode, since
the box must be redrawn each time the cursor is moved). To change the
size of the box (which does not have to be a square) press the
ALT key and any of the ARROW keys simultaneously. To
calculate the statistics, press the ENTER key.